Add support for SBOM generation in soong-only builds

Add an alternative way of collecting metadata in soong-only build, which
is initially done in make.

Bug: 398039178
Test: presubmits
Test: lunch aosp_cf_x86_64_phone-trunk_staging-eng && m && m sbom
Change-Id: I94476db21cf9eac8be7693043f2cd7a2b1bcd8a6